Battery pack structure and electric excavator

Abstract

The utility model relates to the technical field of battery packs, in particular to a battery pack structure and an electric excavator. The battery pack structure comprises a battery pack body and a distribution box, the battery pack body comprises a battery box, the battery box comprises a first cavity and a second cavity communicated with the first cavity, the first cavity is used for accommodating a battery module or a single battery, and the second cavity is used for accommodating a BMS; the second cavity is a convex part arranged on the surface of the first cavity, and the convex part and the first cavity form a step surface; the distribution box is arranged on the step surface, and the distribution box, the first cavity and the second cavity form a structure shaped like a Chinese character'tu '. In the battery pack structure, the distribution box is positioned outside the battery pack body, and the battery pack does not need to be disassembled and assembled when the distribution box can be independently replaced or maintained, so that the operation steps are simplified; in addition, the distribution box, the first cavity and the second cavity form the inverted-T-shaped structure, the structure is more compact and can be better matched with an oval vehicle body of the electric excavator, and the space utilization rate of the vehicle body of the excavator is increased.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a battery pack structure and an electric excavator. Background Art

[0002] The power battery system consists of battery modules, a battery management system (BMS), and a battery disconnect unit (BDU). The battery module is the energy carrier, while the battery management system monitors and controls the battery's status. The BDU distributes and manages electrical energy and contains electrical components such as relays, fuses, and sensors. Multiple battery modules make up a battery pack. To facilitate installation and power output, the BMS and BDU are typically located within the battery pack.

[0003] However, under long-term operation or short-circuit conditions, there are faults such as relay adhesion and fuse blowing, which cause the BDU to lose its basic functions and affect the normal operation of the battery pack. When parts in the BDU need to be replaced or repaired, the battery pack needs to be disassembled and assembled, which is complicated. In addition, because the BMS and BDU are integrated, the rectangular battery pack is large in size, making it difficult to install it in electric vehicles with limited body space. For example, the rear body of an electric excavator is oval, and a conventional rectangular battery pack cannot fully utilize the body space of the electric excavator. The battery pack has a low power level, and the electric excavator's pure electric driving time is short. Utility Model Content

[0004] The present application discloses a battery pack structure and an electric excavator to solve the problems of a battery pack integrated with a BDU, such as the inconvenience of replacing and repairing the BDU and the large size.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] In the first aspect, the present application provides a battery pack structure, which includes a battery pack body and a distribution box. The battery pack body includes a battery box. The battery box includes a first cavity and a second cavity connected to the first cavity. The first cavity is used to accommodate a battery module or a single battery, and the second cavity is used to accommodate a BMS; the second cavity is a raised portion provided on the surface of the first cavity, and the raised portion and the first cavity form a step surface; the distribution box is provided on the step surface, and the distribution box, the first cavity and the second cavity form a "convex" structure.

[0007] The distribution box in this application is located outside the battery pack body. When the distribution box needs to be replaced or repaired, there is no need to disassemble the battery pack body, which can simplify the operation steps and improve work efficiency. In addition, the battery pack structure in this application adopts a modular design. The battery module or single cell is located in the first cavity, and the battery management system is located in the second cavity. The first cavity and the second cavity are connected, which facilitates the connection between the battery module or single cell and the battery management system and is easy to install. Moreover, the first cavity and the second cavity form a stepped surface, and the distribution box is located on the above-mentioned stepped surface. The distribution box, the first cavity and the second cavity form a "convex" structure, which is more compact, so that it can better match the elliptical body of the electric excavator, help to improve the volume energy density of the battery pack, and improve the space utilization of the electric excavator body.

[0008] Furthermore, the battery box and the distribution box are detachably connected.

[0009] Furthermore, the battery box includes a box cover, which includes a first cover body and a second cover body. The first cavity is provided with a first opening, and the second cavity is provided with a second opening. The first cover body covers the first opening, and the second cover body covers the second opening; the second cover body and the first cavity form a step surface, and the second cover body is detachably connected to the distribution box.

[0010] Furthermore, the first cover body and the second cover body are an integrally formed structure, and the first cover body and the second cover body form a step surface; the first cover body is detachably connected to the distribution box.

[0011] Furthermore, the first cover body includes a first plate body and a second plate body vertically connected to the first plate body, and the side of the second plate body away from the first plate body is connected to the second cover body; the second plate body is provided with a first connecting piece, and the distribution box is provided with a second connecting piece, and the first connecting piece and the second connecting piece are detachably connected.

[0012] Further, along the first direction, the second cavity includes a first surface and a second surface arranged opposite to each other, and the distribution box includes a third surface and a fourth surface arranged opposite to each other, and the first surface is close to the third surface of the distribution box; the first surface is provided with a high-voltage adapter interface, a heating high-voltage adapter interface and a low-voltage adapter interface, and the third surface is provided with a high-voltage input interface, a heating high-voltage input interface and an intranet communication interface; the high-voltage adapter interface is electrically connected to the high-voltage input interface, the heating high-voltage adapter interface is electrically connected to the heating high-voltage input interface, and the low-voltage adapter interface is electrically connected to the intranet communication interface.

[0013] Furthermore, a mounting bracket is provided in the second cavity, and the mounting bracket includes a base plate and a mounting plate connected to the base plate. The base plate and the mounting plate form an L-shaped structure. The base plate is fixedly connected to the second cavity, and the mounting plate is provided with a fixing portion for installing the BMS.

[0014] Furthermore, the mounting bracket also includes a fixing plate, which is arranged at the end of the mounting plate away from the base plate. The fixing plate is provided with a through hole for passing a cable tie, and the cable tie is used to fix the BMS wiring harness.

[0015] Furthermore, the mounting bracket also includes a reinforcing plate connecting the base plate and the mounting plate.

[0016] In a second aspect, the present application also provides an electric excavator, which includes the battery pack structure of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 This is a schematic structural diagram of a battery pack structure according to an embodiment of the present application;

[0019] Figure 2 This is a schematic structural diagram of a battery pack body according to an embodiment of the present application;

[0020] Figure 3 This is a schematic diagram of the internal structure of a battery pack body according to an embodiment of the present application;

[0021] Figure 4 This is a structural diagram of a box according to an embodiment of the present application;

[0022] Figure 5 This is a schematic structural diagram of a box cover according to an embodiment of the present application;

[0023] Figure 6 for Figure 5 A partial enlarged view of point A shown in FIG;

[0024] Figure 7 This is a structural diagram of a distribution box according to an embodiment of the present application;

[0025] Figure 8 This is a structural diagram of a distribution box according to an embodiment of the present application;

[0026] Figure 9 A side view of a battery pack structure according to an embodiment of the present application;

[0027] Figure 10 This is a schematic diagram of the internal structure of a distribution box according to an embodiment of the present application;

[0028] Figure 11This is a schematic diagram of the internal structure of the second cavity according to an embodiment of the present application;

[0029] Figure 12 This is a schematic structural diagram of a mounting bracket according to an embodiment of the present application.

[0030] Reference numerals: 100 - battery pack body; 110 - battery box; 111 - first cavity; 112 - second cavity; 113 - box cover; 113a - first cover; 113b - second cover; 114 - box; 120 - battery module; 130 - BMS; 131 - first BMS; 132 - second BMS; 200 - distribution box / BDU; 210 - upper cover; 220 - lower housing; 230a - discharge positive relay; 230b - discharge negative relay; 240a - charge positive relay; 240b - charge negative relay Pole relay; 250-heating relay; 260-heating fuse; 270a-high-voltage input interface; 270b-heating high-voltage input interface; 270c-intranet communication interface; 280a-high-voltage charging interface; 280b-high-voltage discharge interface; 290-vent valve; 300-mounting bracket; 310-base plate; 320-mounting plate; 321-fixing part; 330-fixing plate; 340-reinforcement plate; 400-first high-voltage adapter cable; 500-second high-voltage adapter cable; 600-low-voltage adapter cable; 700-box bracket;

[0031] 10-first plate; 20-second plate; 21-flange; 30a-first connecting member; 31-first connecting plate; 32-second connecting plate; 30b-second connecting member; 40a-third connecting member; 40b-fourth connecting member; 50-first surface; 60-second surface; 70-third surface; 80-fourth surface;

[0032] 01-step surface; 02-first opening; 03-second opening; 04-through hole; 05-high-voltage adapter interface; 06-heating high-voltage adapter interface; 07-low-voltage adapter interface. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0035] Figure 1 This is a schematic diagram of the battery pack structure according to an embodiment of the present application. Figure 2 This is a schematic structural diagram of a battery pack body according to an embodiment of the present application. Figure 3 This is a schematic diagram of the internal structure of the battery pack body of an embodiment of this application. Please refer to Figures 1 to 3 In an embodiment of the present application, a battery pack structure is provided, which includes a battery pack body 100 and a distribution box 200 (battery disconnect unit, BDU). The battery pack body 100 includes a battery box 110. The battery box 110 includes a first cavity 111 and a second cavity 112. The first cavity 111 is used to accommodate a battery module 120 or a single battery, and the second cavity 112 is used to accommodate a battery management system (battery management system, BMS) 130. The first cavity 111 and the second cavity 112 are connected to facilitate the connection between the battery module or single battery and the battery management system, and the installation is convenient. Among them, the second cavity 112 is a raised portion provided on the surface of the first cavity 111, and the raised portion and the first cavity 111 form a step surface 01. The distribution box 200 is arranged on the step surface 01, and the distribution box 200, the first cavity 111 and the second cavity 112 form a "convex" structure, that is, the distribution box 200 and the first cavity 111 are both protrusions on the surface of the second cavity 112, and the distribution box 200 and the first cavity 111 are arranged adjacent to each other, so that the battery pack structure as a whole presents a "convex" structure, which can better match the elliptical body of the electric excavator, make full use of the body space of the electric excavator, help to improve the volume energy density of the battery pack, and improve the space utilization of the electric excavator body.

[0036] In some optional embodiments, along the height direction D of the battery pack structure h The sum of the heights of the distribution box 200 and the second cavity 112 is less than or equal to the height of the first cavity 111, so that the distribution box 200 or the second cavity 112 does not exceed the surface of the first cavity 111, thereby minimizing the space occupied by the battery pack structure.

[0037] Existing battery packs usually place the BDU inside the battery pack. When the BDU needs to be replaced or repaired, the upper shell of the relevant battery pack needs to be disassembled. When the battery pack is unpacked, dust and moisture in the environment may enter the inside of the battery pack box, thereby affecting the service life of the battery pack. Moreover, after the inspection is completed, complex inspections need to be performed on the distribution box and the battery pack to ensure the safety of the battery pack. Compared with the battery pack with the above structure, in the battery pack structure of the present application, the BDU200 and the battery pack body 100 are independent packaging structures. The maintenance of the BDU200 and the battery pack body 100 does not affect each other. When repairing the BDU200, there is no need to disassemble and assemble the battery pack, which reduces the maintenance workload and makes the operation safer.

[0038] like Figure 3 As shown, the battery module 120 or single cell and the BMS 130 are located in different chambers. This is because the battery module 120 or single cell is relatively large, and multiple battery modules 120 or single cells can be arranged in various combinations to form a rectangular parallelepiped structure or a cylindrical structure, etc., that is, the first chamber 111 can be rectangular or cylindrical. At the same time, the BMS 130 occupies a relatively small space and is separately located in the second chamber 112. The shape and structure of the second chamber 112 can be designed based on the shape and structure of the BMS 130. Therefore, the overall structure of the battery pack body 100 is more compact, which helps to improve space utilization.

[0039] In some optional embodiments, the battery box 110 and the distribution box 200 are detachably connected, thereby facilitating replacement and maintenance of the distribution box 200. The present application does not limit the manner of detachable connection between the two, and the two may be screwed or clamped.

[0040] It is understandable that when the first cavity 111 is a cuboid, the first cavity 111 includes six surfaces, and the second cavity 112 can be located on any of the six surfaces of the first cavity 111 , and is specifically configured according to actual needs.

[0041] Figure 4 This is a structural diagram of a box according to an embodiment of the present application. Figure 5 This is a schematic diagram of the structure of the box cover of an embodiment of the present application, refer to Figure 4 and Figure 5The battery box 110 includes a box body 114 and a box cover 113, and the box cover 113 and the box body 114 are enclosed to form a sealed chamber. Optionally, the box body 114 and the box cover 113 are connected by bolts. Among them, the box cover 113 includes a first cover 113a and a second cover 113b. The first cavity 111 is provided with a first opening 02, and the first cover 113a covers the first opening 02 to form a accommodating cavity for accommodating the battery module 120 or the single cell. The second cavity 112 is provided with a second opening 03, and the second cover 113b covers the second opening 03 to form a accommodating cavity for accommodating the BMS 130. The first cavity 111 and the second cavity 112 are connected to facilitate electrical connection between the battery module 120 or the single cell and the BMS 130.

[0042] The second cover 113b and the first cavity 111 can form a step surface 01, that is, along the height direction D of the battery pack structure. h The height of the second cavity 112 is smaller than the height of the first cavity 111. The distribution box 200 can be disposed on the step surface 01, and the second cover 113b is detachably connected to the distribution box 200.

[0043] It is understandable that the first cover 113a and the second cover 113b can be independent structures or an integrally formed structure, and the specific design is based on actual needs.

[0044] like Figure 5 As shown, the first cover 113a and the second cover 113b are integrally formed, and the first cover 113a and the second cover 113b form a stepped surface 01 for mounting the distribution box 200. The first cover 113a may be a groove structure, with the opening of the groove structure positioned opposite the first opening 02. It is understood that the first cover 113a may also be an L-shaped structure, which is not limited in this application.

[0045] Among them, one surface of the distribution box 200 is detachably connected to the first cover 113a, and the other surface of the distribution box 200 is detachably connected to the second cover 113b. It is understandable that the detachable connection method is not limited in this application, and the detachable connection method includes but is not limited to screw connection, snap connection, etc. When the BDU200 needs to be replaced or repaired, it is only necessary to remove the BDU200 from the step surface 01, and there is no need to remove the battery pack body 100, and there is no need to disassemble other parts of the vehicle before disassembling the battery pack body 100, which greatly improves the efficiency of maintenance. During maintenance operations, the battery pack body 100 does not need to open the box cover 113, and the battery module 120 or single cell is not exposed, thereby avoiding the impact on the battery pack life during the maintenance process.

[0046] In some optional embodiments, the first cover 113a includes a first plate 10 and a second plate 20 perpendicularly connected to the first plate 10. The second plate 20 is connected to the second cover 113b on a side away from the first plate 10. The second plate 20 is provided with a first connector 30a, and the distribution box 200 is provided with a second connector 30b. The first connector 30a and the second connector 30b are detachably connected.

[0047] In some optional embodiments, the second plate 20 includes a flange 21 connected to an edge of the second plate 20. The flange 21 is provided with mounting holes for receiving bolts, screws, or other connectors that connect the first cover 113a and the box body 114. When the second plate 20 is provided with the flange 21, the edge of the flange 21 away from the second plate 20 is connected to the second cover 113b.

[0048] Figure 6 for Figure 5 The local enlarged view of point A shown in Figure 5 As shown, the first connecting member 30a includes a first connecting plate 31 and a second connecting plate 32 connected to the first connecting plate 31. The end of the first connecting plate 31 away from the second connecting plate 32 is connected to the second plate body 20. Specifically, the two can be welded. The second connecting plate 32 is provided with a mounting hole, and the mounting hole can be used to penetrate bolts, screws and other connecting members that connect the second connecting plate 32 and the second connecting plate 32. Among them, the second connecting plate 32 is spaced apart from the second plate body 20 to avoid the influence of bolts, screws and other connecting members on the second plate body 20 or the inside of the first cavity 111. The first connecting member 30a may include one or more first connecting plates 31. In addition, the number of the first connecting members 30a may be one or more. As shown Figure 5 As shown, in this embodiment, there are two first connecting members 30 a , and each first connecting member 30 a includes two first connecting plates 31 .

[0049] Figure 7 This is a schematic diagram of the structure of a distribution box according to an embodiment of the present application. Figure 7 The distribution box 200 includes a lower shell 220 and an upper cover 210, which are arranged to form a chamber. The second connecting member 30b can be a fixed side plate provided on the lower shell 220, and bolts, screws and other connecting members pass through the fixed side plate and then through the mounting holes on the second connecting plate 32, thereby realizing a detachable connection between the distribution box 200 and the first cover 113a. The number of the second connecting members 30b can be one or more, and can be set according to actual needs. Figure 7As shown, along the first direction D1, a second connector 30b is provided at each end of the sidewall of the distribution box 200 facing the first cover 113a. The first direction D1 may be the length direction of the battery pack structure, while the second direction D2 is the width direction of the battery pack structure. Conversely, when the first direction D1 is the width direction of the battery pack structure, the second direction D2 is the length direction of the battery pack structure.

[0050] Continue to refer to Figures 5 to 7 , the surface of the second cover 113b facing the distribution box 200 is provided with a third connecting member 40a, and the distribution box 200 is provided with a fourth connecting member 40b, and the third connecting member 40a and the fourth connecting member 40b are detachably connected. Specifically, the third connecting member 40a can be a plate welded to the second cover 113b, and the plate is provided with a mounting hole. Correspondingly, the fourth connecting member 40b can be a base provided on the lower shell 220 of the distribution box 200, and bolts, screws and other connecting members pass through the base and extend into the mounting holes of the above-mentioned plate, thereby realizing a detachable connection between the second cover 113b and the distribution box 200. Among them, the base can be welded to the side of the distribution box 200. The shape and structure of the base are designed according to actual conditions, as long as the connection between the distribution box 200 and the second cover 113b is achieved, while minimizing interference with other components.

[0051] Figure 8 This is a structural diagram of a distribution box according to an embodiment of the present application. Figure 9 This is a side view of the battery pack structure of an embodiment of the present application. Please refer to Figure 3 as well as Figures 7 to 9Along the first direction D1, the second cavity 112 includes a first surface 50 and a second surface 60 arranged opposite to each other, and the distribution box 200 includes a third surface 70 and a fourth surface 80 arranged opposite to each other. The first surface 50 is close to the third surface 70 of the distribution box 200, that is, the first surface 50 and the third surface 70 are located at the same end along the first direction D1. Among them, the first surface 50 is provided with a high-voltage adapter interface 05, a heating high-voltage adapter interface 06, and a low-voltage adapter interface 07, and the third surface 70 is provided with a high-voltage input interface 270a, a heating high-voltage input interface 270b, and an intranet communication interface 270c. The high-voltage adapter interface 05 and the high-voltage input interface 270a are electrically connected through the first high-voltage adapter line 400, and the heating high-voltage adapter interface 06 and the heating high-voltage input interface 270b are electrically connected through the second high-voltage adapter line 500, thereby realizing a high-voltage power plug-in connection between the BDU 200 and the battery pack body 100. The low-voltage adapter interface 07 is electrically connected to the intranet communication interface 270c via a low-voltage adapter cable 600, thereby enabling signal connection between the BDU 200 and the battery pack body 100. Therefore, the first surface 50 and the third surface 70 are located on the same side, shortening the connection between the distribution box 200 and the battery pack body 100. Furthermore, the BMS 130 is positioned adjacent to the BDU 200. The battery modules 120 or individual cells are connected to the BMS 130 through a busbar, and the BDU 200 busbar is connected to the BMS 130. This reduces the battery pack's footprint and improves integration.

[0052] Continue to refer to Figure 8 The fourth surface 80 of the distribution box 200 is provided with a high-voltage charging interface 280a and a high-voltage discharge interface 280b. The high-voltage charging interface 280a is primarily responsible for receiving power from an external power source and transmitting the power to the distribution box 200 via a high-voltage wiring harness. The high-voltage discharge interface 280b is involved in the flow of current when the vehicle is in motion.

[0053] In some optional embodiments, a vent valve 290 is provided on the fourth surface 80 of the distribution box 200. This vent valve 290 is used to balance the air pressure inside the distribution box 200 and the external environment. The distribution box 200 is equipped with electrical components. When these components operate, the heat generated by the current can increase the air pressure inside the distribution box 200. The vent valve 290 ensures that the air pressure inside and outside the distribution box 200 is consistent, thereby ensuring the safe operation of the BDU 200.

[0054] Figure 10 This is a schematic diagram of the internal structure of a distribution box according to an embodiment of the present application. Figure 10The distribution box 200 chamber is equipped with a positive discharge relay 230a, a negative discharge relay 230b, a positive charge relay 240a, a negative charge relay 240b, a heating relay 250, and a heating fuse 260. The positive discharge relay 230a and the positive charge relay 240a are connected to the positive terminal of the high-voltage input interface 270a of the BDU 200, while the negative discharge relay 230b and the negative charge relay 240b are connected to the negative terminal of the high-voltage input interface 270a of the BDU 200. The positive discharge relay 230a and the negative discharge relay 230b are connected to the high-voltage discharge interface 280b. The positive charge relay 240a and the negative charge relay 240b are connected to the high-voltage charging interface 280a. The heating relay 250 is connected to the high-voltage heating input interface 270b of the BDU 200, and the heating relay 250 is connected to the heating fuse 260, forming a heating circuit. The relay control signal of BMS130 is connected to BMS130 through the intranet communication interface, thereby controlling the on and off of the relay. The distribution box 200 in this application can meet the requirements of various charging and discharging conditions of the battery pack body 100 through reasonable electrical system design.

[0055] Figure 11 This is a schematic diagram of the internal structure of the second cavity according to an embodiment of the present application. Figure 12 This is a schematic diagram of the structure of the mounting bracket of an embodiment of the present application, please refer to Figure 11 and Figure 12 A BMS 130 is provided in the second cavity 112. The BMS 130 includes a first BMS 131 and a second BMS 132. The BMS 130 has functions such as real-time acquisition of sampling information of the battery module 120 or single battery, high voltage detection, insulation detection, data storage, and on / off control of each relay.

[0056] Continue to refer to Figure 11 and Figure 12 , a box bracket 700 and a mounting bracket 300 provided on the box bracket 700 are provided in the second cavity 112, and the box bracket 700 is used to fix the mounting bracket 300 to the bottom of the second cavity 112. Among them, the mounting bracket 300 includes a base plate 310 and a mounting plate 320 connected to the base plate 310, and the base plate 310 and the mounting plate 320 form an L-shaped structure. The base plate 310 is fixedly connected to the second cavity 112, and the mounting plate 320 is provided with a fixing portion 321 for installing the BMS130. Among them, the base plate 310 and the bottom wall of the second cavity 112 can be detachably connected by bolts, screws and other connecting parts. The fixing portion 321 and the BMS130 can be connected by bolts. Optionally, the number of fixing portions 321 can be two or more. As Figure 12As shown, four fixing portions 321 are provided on a mounting plate 320 , and the four fixing portions 321 are respectively located at the four corners of the mounting plate 320 .

[0057] The BMS 130 includes a first BMS 131 and a second BMS 132 . Correspondingly, two mounting brackets 300 are provided in the second cavity 112 .

[0058] In some optional embodiments, the mounting bracket 300 further includes a fixing plate 330, which is disposed at the end of the mounting plate 320 away from the base plate 310. The fixing plate 330 has a through hole 04 for inserting a cable tie, which is used to secure the wiring harness of the BMS 130. The fixing plate 330 and the mounting plate 320 form an angle α that is oriented away from the BMS 130 connected to the mounting plate 320, and the angle α is less than or equal to 90°.

[0059] In some optional embodiments, the mounting bracket 300 further includes a reinforcing plate 340 connecting the base plate 310 and the mounting plate 320. The reinforcing plate 340 can enhance the structural strength of the mounting bracket 300. The number of reinforcing plates 340 can be one, two, or more.

[0060] Based on the same technical concept, the present application also provides an electric excavator, which includes the battery pack structure of various possible embodiments of the present application. The rear portion of the electric excavator has an elliptical body, and the battery pack structure of the present application is a "convex" structure, which can better match the elliptical body of the electric excavator, helping to increase the volumetric energy density of the battery pack, improve the space utilization of the electric excavator body, and thus increase the battery life of the electric excavator.

[0061] Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations.

Claims

1. A battery pack structure, characterized in that: The battery pack includes a battery pack body and a distribution box. The battery pack body includes a battery box. The battery box includes a first cavity and a second cavity connected to the first cavity. The first cavity is used to accommodate a battery module or a single battery. The second cavity is used to accommodate a BMS. The second cavity is a raised portion provided on the surface of the first cavity, and the raised portion and the first cavity form a stepped surface; The distribution box is arranged on the step surface, and the distribution box, the first cavity and the second cavity form a convex structure.

2. The battery pack structure according to claim 1, characterized in that: The battery box is detachably connected to the distribution box.

3. The battery pack structure according to claim 1, characterized in that: The battery box includes a box cover, the box cover includes a first cover body and a second cover body, the first cavity is provided with a first opening, the second cavity is provided with a second opening, the first cover body covers the first opening, and the second cover body covers the second opening; The second cover and the first cavity form the step surface, and the second cover is detachably connected to the distribution box.

4. The battery pack structure according to claim 3, characterized in that: The first cover body and the second cover body are an integrally formed structure, and the first cover body and the second cover body form the step surface; The first cover is detachably connected to the distribution box.

5. The battery pack structure according to claim 4, characterized in that: The first cover includes a first plate and a second plate vertically connected to the first plate, and a side of the second plate away from the first plate is connected to the second cover; The second plate body is provided with a first connecting piece, and the distribution box is provided with a second connecting piece. The first connecting piece and the second connecting piece are detachably connected.

6. The battery pack structure according to any one of claims 1 to 5, characterized in that: Along the first direction, the second cavity includes a first surface and a second surface that are oppositely disposed, the distribution box includes a third surface and a fourth surface that are oppositely disposed, and the first surface is close to the third surface of the distribution box; The first surface is provided with a high-voltage transfer interface, a heating high-voltage transfer interface and a low-voltage transfer interface, and the third surface is provided with a high-voltage input interface, a heating high-voltage input interface and an intranet communication interface; The high-voltage transfer interface is electrically connected to the high-voltage input interface, the heating high-voltage transfer interface is electrically connected to the heating high-voltage input interface, and the low-voltage transfer interface is electrically connected to the intranet communication interface.

7. The battery pack structure according to claim 6, characterized in that: A mounting bracket is provided in the second cavity, and the mounting bracket includes a base plate and a mounting plate connected to the base plate. The base plate and the mounting plate form an L-shaped structure. The base plate is fixedly connected to the second cavity, and the mounting plate is provided with a fixing portion for mounting the BMS.

8. The battery pack structure according to claim 7, characterized in that: The mounting bracket further includes a fixing plate, which is provided at an end portion of the mounting plate away from the base plate. The fixing plate is provided with a through hole for passing a cable tie, and the cable tie is used to fix the BMS wiring harness.

9. The battery pack structure according to claim 7, characterized in that: The mounting bracket further includes a reinforcing plate connecting the base plate and the mounting plate.

10. An electric excavator, characterized in that: Comprising a battery pack structure as described in any one of claims 1 to 9.

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